BaWade-Giles romanization PaPinyin Baancient tribe and later an ancient Chinese feudal state that came into being in the 11th century BCBCE, under the Xi (WesternChou) Zhou dynasty. It was situated in the Chia-ling valley of what is now central Szechwan. Pa Jialing valley of present-day eastern Sichuan and Chongqing municipality. Ba established relations with the mid-Yangtze kingdom of Ch’u Chu in the 5th century BCBCE. Shortly before In 316 BC, BCEthe state was conquered by the Ch’in Qin and incorporated into the Ch’in Qin empire. In the middle of the mid-3rd century BC, BCEthe Pa Ba region became part of the kingdom of Shu and was totally independent of northern and central China. The central region of Szechwan eastern Sichuan and Chongqing is still sometimes known as the Pa Ba region.